.header{
    width: 100%;
    height: 88px;
    box-shadow: 0 0 20px 0 #d8d8d8;
    background-color: #fff;
    box-sizing: border-box;
    position: fixed;
    left: 0;
    top: 0;
    z-index: 999;
}
.header .header_left{
    width: 600px;
    height: 100%;
}
.header_left .logo{
    width: 50px;
    height: 100%;
    background: url("../img/logo.png") no-repeat center center;
    background-size: 50px 50px;
    margin-left: 80px;
    margin-right: 20px;
}
.header_left .header_title{
    width: 300px;
    font-family: "宋体";
    font-size: 20px;
    font-weight:bold;
    float: left;
    position: absolute;
    left: 150px;
    top: 29px;
}
.header .header_right{
    width: 600px;
    height: 100%;
    font-size: 14px;
    position: absolute;
    top: 0;
    right: 0;
}
.header_right .nav_left{
    list-style: none;
    width: 400px;
    line-height: 88px;

    float: left;
    display:flex;
    justify-content: space-between;
}

.nav_left li{
    height: 88px;
    float: left;
    box-sizing: border-box;
}
.nav_left li:hover{
    border-bottom: 4px solid #3385ff;
    color: #3385ff;
}

/*登录*/
.header_right .nav_right{
    width: 100px;
    line-height: 88px;
    float: left;
    margin-left: 50px;
    display:flex;
    justify-content: space-between;
    /*display: inline-block;*/
    /*display: none;*/
}
.header .nav_right li{
    width: 60px;
    height: 30px;
    line-height: 30px;
    text-align: center;
    margin-top: 30px;
    float: left;
}
.login{
    background-color: #3385ff;
    color: white;
    border-radius:3px;
}

/*用户登录成功*/
.header .nav_user{
    width: 180px;
    height: 90px;
    margin-left: 20px;
    float: right;
    display: none;
}
.header .nav_user>li{
    width: 60px;
    height: 30px;
    line-height: 30px;
    text-align: left;
    margin-top: 30px;
    float: left;
}

.header .nav_user .user_img{
    background: url("../img/用户1.png") no-repeat center center;
    background-size: 30px 30px;
}

.header .nav_user .user_img:hover{
    background: url("../img/用户2.png") no-repeat center center;
    background-size: 30px 30px;
}
.header .nav_user .user_img:hover .sub li{
    opacity: 0.8;
}

.sub{
    width: 100%;
    padding-top: 50px;
}
.sub>li{
    width: 100%;
    line-height: 40px;
    text-align: center;
    background-color: #ffffff;
    float: left;
    transition: all 1s;
    opacity: 0;
    cursor:pointer;
}